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THESEUS: a Key Space Mission Concept for Multi-Messenger Astrophysics THESEUS: a key space mission concept for Multi-Messenger Astrophysics G. Strattaa, R. Ciolfib,c, L. Amatid, E. Bozzoe, G. Ghirlandaf, E. Maioranod, L. Nicastrod, A. Rossid, S. Vinciguerrag, F. Fronterah,d, D. Gotz¨ i, C. Guidorzih, P. O’Brienj, J. P. Osbornej, N. Tanvirk, M. Branchesil,m, E. Brocaton, M. G. Dainottio, M. De Pasqualep, A. Gradoq, J. Greinerr, F. Longos,t, U. Maiou,v, D. Mereghettiw, R. Mignaniw,x, S. Piranomontey, L. Rezzollaz,aa, R. Salvaterraw, R. Starlingj, R. Willingalej, M. Boer¨ ab, A. Bulgarellid, J. Caruanaac, S. Colafrancescoad, M. Colpiae, S. Covinof, P. D’Avanzof, V. D’Eliaaf,y, A. Dragoag, F. Fuschinod, B. Gendreah,ai, R. Hudecaj,ak, P. Jonkeral,am, C. Labantid, D. Malesanian, C. G. Mundellao, E. Palazzid, B. Patricelliap, M. Razzanoap, R. Campanad, P. Rosatih, T. Rodicav, D. Szecsi´ ar,as, A. Stamerraap, M. van Puttenai, S. Verganiau,f, B. Zhangav, M. Bernardiniaw aUrbino University, via S. Chiara 27, 60129, Urbino (PU, Italy) bINAF, Osservatorio Astronomico di Padova, Vicolo dell’ Osservatorio 5, I-35122 Padova, Italy cINFN-TIFPA, Trento Institute for Fundamental Physics and Applications, via Sommarive 14, I-38123 Trento, Italy dINAF-IASF Bologna, via P. Gobetti, 101. I-40129 Bologna, Italy eDepartment of Astronomy, University of Geneva, ch. d’Ecogia´ 16, CH-1290 Versoix, Switzerland fINAF - Osservatorio astronomico di Brera, Via E. Bianchi 46, Merate (LC), I-23807, Italy gInstitute of Gravitational Wave Astronomy & School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom hDepartment of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, I-44122 Ferrara, Italy iIRFU/D´epartementd’Astrophysique, CEA, Universit´eParis-Saclay, F-91191, Gif-sur-Yvette, France jDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom kUniversity of Leicester, Department of Physics and Astronomy and Leicester Institute of Space & Earth Observation, University Road, Leicester, LE1 7RH, United Kingdom lUniversit degli Studi di Urbino Carlo Bo, via A. Saffi 2, 61029, Urbino mINFN, Sezione di Firenze, via G. Sansone 1, 50019, Sesto Fiorentino, Italy nINAF - Astronomico di Teramo, Mentore Maggini s.n.c., 64100 Teramo, Italy oDepartment of Physics & Astronomy, Stanford University, Via Pueblo Mall 382, Stanford CA, 94305-4060, USA pDepartment of Astronomy and Space Sciences, Istanbul University, Beyazit, 34119, Istanbul, Turkey qINAF - Capodimonte Astronomical observatory Naples, Via Moiariello 16 I-80131, Naples, Italy rMax Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, 85741 Garching, Germany sDepartment of Physics, University of Trieste, via Valerio 2, Trieste, Italy tINFN Trieste, via Valerio 2, Trieste, Italy uLeibniz Institut for Astrophysics, An der Sternwarte 16, 14482 Potsdam, Germany vINAF-Osservatorio Astronomico di Trieste, via G. Tiepolo 11, 34131 Trieste, Italy wINAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via E. Bassini 15, 20133, Milano, Italy xJanusz Gil Institute of Astronomy, University of Zielona G´ora, Lubuska 2, 65-265, Zielona G´ora, Poland yINAF-Osservatorio Astronomico di Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy zInstitut f¨urTheoretische Physik, Johann Wolfgang Goethe-Universit¨at,Max-von-Laue-Straße 1, 60438 Frankfurt, Germany aaFrankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, 60438 Frankfurt, Germany abARTEMIS, CNRS UMR 5270, Universit´eCˆoted’Azur, Observatoire de la Cˆoted’Azur, boulevard de l’Observatoire, CS 34229, F-06304 Nice Cedex 04, France acDepartment of Physics & Institute of Space Sciences & Astronomy, University of Malta, Msida MSD 2080, Malta adSchool of Physics, University of Witwatersrand, Private Bag 3, Wits-2050, Johannesburg, South Africa aeDipartimento di Fisica G. Occhialini, Universit degli Studi di Milano Bicocca & INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy afSpace Science Data Center (SSDC), Agenzia Spaziale Italiana, via del Politecnico, s.n.c., I-00133, Roma, Italy agINFN, Via Enrico Fermi 40, Frascati, Italy ahUniversity of the Virgin Islands, 2 John Brewer’s Bay, 00802 St Thomas, US Virgin Islands aiEtelman Observatory, Bonne Resolution, St Thomas, US Virgin Islands ajCzech Technical University, Faculty of Electrical Engineering, Prague 16627, Czech Republic akKazan Federal University, Kazan 420008, Russian Federations arXiv:1712.08153v3 [astro-ph.HE] 27 Mar 2018 alSRON, Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, The Netherlands amDepartment of Astrophysics/IMAPP, Radboud University, P.O. Box 9010, NL-6500 GL Nijmegen, The Netherlands anDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark aoDepartment of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom apScuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy aqSPACE-SI, Slovenian Centre of Excellence for Space Sciences and Technologies, Ljubljana, Slovenia arAstronomical Institute of the Czech Academy of Sciences, Friˇcova 298, 25165 Ondˇrejov, Czech Republic asSchool of Physics and Astronomy and Institute of Gravitational Wave Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom atSejong University, 98 Gunja-Dong Gwangin-gu, Seoul 143-747, Korea 1 auGEPI, Observatoire de Paris, PSL Research University, CNRS, Place Jules Janssen, 92190 Meudon avDepartment of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA awUniversit´eMontpellier 2, Campus Triolet, Place Eugene Bataillon - CC 070, 34095 Montpellier Cedex 5 Abstract The recent discovery of the electromagnetic counterpart of the gravitational wave source GW170817, has demon- strated the huge informative power of multi-messenger observations. During the next decade the nascent field of multi-messenger astronomy will mature significantly. Around 2030, third generation gravitational wave detectors will be roughly ten times more sensitive than the current ones. At the same time, neutrino detectors currently upgrading to multi km3 telescopes, will include a 10 km3 facility in the Southern hemisphere that is expected to be operational around 2030. In this review, we describe the most promising high frequency gravitational wave and neutrino sources that will be detected in the next two decades. In this context, we show the important role of the Transient High Energy Sky and Early Universe Surveyor (THESEUS), a mission concept proposed to ESA by a large international collaboration in response to the call for the Cosmic Vision Programme M5 missions. THESEUS aims at providing a substantial advancement in early Universe science as well as playing a fundamental role in multi–messenger and time–domain astrophysics, operating in strong synergy with future gravitational wave and neutrino detectors as well as major ground- and space-based telescopes. This review is an extension of the THESEUS white paper (Amati et al., 2017), also in light of the discovery of GW170817/GRB170817A that was announced on October 16th, 2017. Keywords: X-ray sources; X-ray bursts; gamma-ray sources; gamma-ray bursts; Astronomical and space-research instrumentation 1. Introduction With the first detection in 2015 of gravitational waves (GWs) from black hole binary systems during their coa- lescing phase (Abbott et al., 2016a,b), a new observational window on the Universe has been opened. Stellar-mass black hole coalescences, together with binary neutron star (NS-NS), NS-black hole (BH) mergers, burst sources as core-collapsing massive stars and possibly NS instability episodes, are among the main targets of ground-based GW detectors1. Some of these sources are also expected to produce neutrinos and electromagnetic (EM) signals over the entire spectrum, from radio to gamma-rays. These expectations were astonishingly satisfied for the first time on August 17th, 2017, when a GW signal consis- tent with a binary neutron star merger system (Abbott et al., 2017a) was found shortly preceding the short gamma-ray burst GRB170817A (Abbott et al., 2017b). The GW170817 90% confidence sky area obtained with the Advanced LIGO (Harry and LIGO Scientific Collaboration, 2010) and Advanced Virgo (Acernese et al., 2015) network was fully contained within the GRB error box. In addition, a “kilonova” (or “macronova”) emission (AT2017gfo), theo- retically predicted from such systems (e.g. Li and Paczynski´ , 1998), has been found within the GW-GRB error-box and positionally consistent with NGC4993, a lenticular galaxy at a distance compatible with the GW signal (Abbott et al., 2017; Smartt et al., 2017; Tanvir et al., 2017; Pian et al., 2017; Coulter et al., 2017). By the end of the twenties, the sky will be routinely monitored by the second-generation GW detector network, composed by the two Advanced LIGO (aLIGO) detectors in the US, Advanced Virgo in Italy, ILIGO in India (e.g. Abbott et al., 2016) and KAGRA in Japan (Somiya, 2012). Then, around 2030, more sensitive third generation ground-based GW interferometers, such as the Einstein Telescope (ET, e.g. Punturo et al., 2010) and LIGO Cosmic Explorer (LIGO-CE, e.g. Abbott et al., 2017), are planned to be operational and to provide an increase of roughly one order of magnitude in sensitivity. In parallel to these advancements, IceCube and KM3nNeT and the advent of 10 km3 detectors (e.g. IceCube-Gen2, IceCube-Gen2 Collaboration et al., 2014, and references therein) will enable to gain high-statistics samples
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